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Glossary » Beams » Simply Supported » Uniformly Distributed Load » Two Equal Spans » S Section Steel I Beam » S15 × 42.9
S Section Steel I Beam | Single Span | Two Equal Spans | Three Equal Spans | Four Equal Spans

For a simply supported beam in two equal spans, we compute the displacement at the middle of each span and the maximum normal stress occuring at the center support of the beam.
The tabulated data listed in this page are calculated based on the area moment of inertia (Ixx = 447 in4) for the S15 × 42.9 S Section Steel I Beam and the typical Young's modulus (E = 3.046 × 107 psi) of steels. Note that the typical yielding stress of steels can range from 1.015 × 104 to 2.970 × 105 psi. The purpose of this page is to give a rough estimation of the load-bearing capacity of this particular beam, rather than a guideline for designing actual building structures. Please check your local building codes for regulatory requirements.
Note: The weight of the beam itself is not included in the calculation.

 Steel I Beam: S15 × 42.9 (S15 inch tall × 42.9 lbf/ft) L = 3.00 ft (lbf/ft) (in) (psi) 42.9 2.30 × 10-6 9.72 50.0 2.68 × 10-6 11.3 60.0 3.21 × 10-6 13.6 70.0 3.75 × 10-6 15.9 80.0 4.28 × 10-6 18.1 90.0 4.82 × 10-6 20.4 100 5.35 × 10-6 22.7 200 1.07 × 10-5 45.3 300 1.61 × 10-5 68.0 400 2.14 × 10-5 90.6 500 2.68 × 10-5 113 600 3.21 × 10-5 136 700 3.75 × 10-5 159 800 4.28 × 10-5 181 900 4.82 × 10-5 204 1000 5.35 × 10-5 227 2000 1.07 × 10-4 453 3000 1.61 × 10-4 680 4000 2.14 × 10-4 906 5000 2.68 × 10-4 1130 6000 3.21 × 10-4 1360 7000 3.75 × 10-4 1590 8000 4.28 × 10-4 1810 9000 4.82 × 10-4 2040 1.00 × 104 5.35 × 10-4 2270 2.00 × 104 0.00107 4530 3.00 × 104 0.00161 6800 4.00 × 104 0.00214 9060 5.00 × 104 0.00268 1.13 × 104 6.00 × 104 0.00321 1.36 × 104 7.00 × 104 0.00375 1.59 × 104 8.00 × 104 0.00428 1.81 × 104 9.00 × 104 0.00482 2.04 × 104 1.00 × 105 0.00535 2.27 × 104 2.00 × 105 0.0107 4.53 × 104 3.00 × 105 0.0161 6.80 × 104 4.00 × 105 0.0214 9.06 × 104 5.00 × 105 0.0268 1.13 × 105 6.00 × 105 0.0321 1.36 × 105 7.00 × 105 0.0375 1.59 × 105 8.00 × 105 0.0428 1.81 × 105 9.00 × 105 0.0482 2.04 × 105 1.00 × 106 0.0535 2.27 × 105 1.31 × 106 0.0702 2.97 × 105
 Steel I Beam: S15 × 42.9 (S15 inch tall × 42.9 lbf/ft) L = 5.00 ft (lbf/ft) (in) (psi) 42.9 1.77 × 10-5 27.0 50.0 2.07 × 10-5 31.5 60.0 2.48 × 10-5 37.8 70.0 2.89 × 10-5 44.0 80.0 3.31 × 10-5 50.3 90.0 3.72 × 10-5 56.6 100 4.13 × 10-5 62.9 200 8.26 × 10-5 126 300 1.24 × 10-4 189 400 1.65 × 10-4 252 500 2.07 × 10-4 315 600 2.48 × 10-4 378 700 2.89 × 10-4 440 800 3.31 × 10-4 503 900 3.72 × 10-4 566 1000 4.13 × 10-4 629 2000 8.26 × 10-4 1260 3000 0.00124 1890 4000 0.00165 2520 5000 0.00207 3150 6000 0.00248 3780 7000 0.00289 4400 8000 0.00331 5030 9000 0.00372 5660 1.00 × 104 0.00413 6290 2.00 × 104 0.00826 1.26 × 104 3.00 × 104 0.0124 1.89 × 104 4.00 × 104 0.0165 2.52 × 104 5.00 × 104 0.0207 3.15 × 104 6.00 × 104 0.0248 3.78 × 104 7.00 × 104 0.0289 4.40 × 104 8.00 × 104 0.0331 5.03 × 104 9.00 × 104 0.0372 5.66 × 104 1.00 × 105 0.0413 6.29 × 104 2.00 × 105 0.0826 1.26 × 105 3.00 × 105 0.124 1.89 × 105 4.00 × 105 0.165 2.52 × 105 4.72 × 105 0.195 2.97 × 105
 Steel I Beam: S15 × 42.9 (S15 inch tall × 42.9 lbf/ft) L = 10.0 ft (lbf/ft) (in) (psi) 42.9 2.84 × 10-4 108 50.0 3.31 × 10-4 126 60.0 3.97 × 10-4 151 70.0 4.63 × 10-4 176 80.0 5.29 × 10-4 201 90.0 5.95 × 10-4 227 100 6.61 × 10-4 252 200 0.00132 503 300 0.00198 755 400 0.00264 1010 500 0.00331 1260 600 0.00397 1510 700 0.00463 1760 800 0.00529 2010 900 0.00595 2270 1000 0.00661 2520 2000 0.0132 5030 3000 0.0198 7550 4000 0.0264 1.01 × 104 5000 0.0331 1.26 × 104 6000 0.0397 1.51 × 104 7000 0.0463 1.76 × 104 8000 0.0529 2.01 × 104 9000 0.0595 2.27 × 104 1.00 × 104 0.0661 2.52 × 104 2.00 × 104 0.132 5.03 × 104 3.00 × 104 0.198 7.55 × 104 4.00 × 104 0.264 1.01 × 105 5.00 × 104 0.331 1.26 × 105 6.00 × 104 0.397 1.51 × 105 7.00 × 104 0.463 1.76 × 105 8.00 × 104 0.529 2.01 × 105 9.00 × 104 0.595 2.27 × 105 1.00 × 105 0.661 2.52 × 105 1.18 × 105 0.780 2.97 × 105
 Steel I Beam: S15 × 42.9 (S15 inch tall × 42.9 lbf/ft) L = 15.0 ft (lbf/ft) (in) (psi) 42.9 0.00144 243 50.0 0.00167 283 60.0 0.00201 340 70.0 0.00234 396 80.0 0.00268 453 90.0 0.00301 510 100 0.00335 566 200 0.00669 1130 300 0.0100 1700 400 0.0134 2270 500 0.0167 2830 600 0.0201 3400 700 0.0234 3960 800 0.0268 4530 900 0.0301 5100 1000 0.0335 5660 2000 0.0669 1.13 × 104 3000 0.100 1.70 × 104 4000 0.134 2.27 × 104 5000 0.167 2.83 × 104 6000 0.201 3.40 × 104 7000 0.234 3.96 × 104 8000 0.268 4.53 × 104 9000 0.301 5.10 × 104 1.00 × 104 0.335 5.66 × 104 2.00 × 104 0.669 1.13 × 105 3.00 × 104 1.00 1.70 × 105 4.00 × 104 1.34 2.27 × 105 5.00 × 104 1.67 2.83 × 105 5.25 × 104 1.76 2.97 × 105
 Steel I Beam: S15 × 42.9 (S15 inch tall × 42.9 lbf/ft) L = 20.0 ft (lbf/ft) (in) (psi) 42.9 0.00454 432 50.0 0.00529 503 60.0 0.00635 604 70.0 0.00740 705 80.0 0.00846 805 90.0 0.00952 906 100 0.0106 1010 200 0.0212 2010 300 0.0317 3020 400 0.0423 4030 500 0.0529 5030 600 0.0635 6040 700 0.0740 7050 800 0.0846 8050 900 0.0952 9060 1000 0.106 1.01 × 104 2000 0.212 2.01 × 104 3000 0.317 3.02 × 104 4000 0.423 4.03 × 104 5000 0.529 5.03 × 104 6000 0.635 6.04 × 104 7000 0.740 7.05 × 104 8000 0.846 8.05 × 104 9000 0.952 9.06 × 104 1.00 × 104 1.06 1.01 × 105 2.00 × 104 2.12 2.01 × 105 2.95 × 104 3.12 2.97 × 105
 Steel I Beam: S15 × 42.9 (S15 inch tall × 42.9 lbf/ft) L = 25.0 ft (lbf/ft) (in) (psi) 42.9 0.0111 675 50.0 0.0129 786 60.0 0.0155 944 70.0 0.0181 1100 80.0 0.0207 1260 90.0 0.0232 1420 100 0.0258 1570 200 0.0516 3150 300 0.0775 4720 400 0.103 6290 500 0.129 7860 600 0.155 9440 700 0.181 1.10 × 104 800 0.207 1.26 × 104 900 0.232 1.42 × 104 1000 0.258 1.57 × 104 2000 0.516 3.15 × 104 3000 0.775 4.72 × 104 4000 1.03 6.29 × 104 5000 1.29 7.86 × 104 6000 1.55 9.44 × 104 7000 1.81 1.10 × 105 8000 2.07 1.26 × 105 9000 2.32 1.42 × 105 1.00 × 104 2.58 1.57 × 105 1.89 × 104 4.88 2.97 × 105
 Steel I Beam: S15 × 42.9 (S15 inch tall × 42.9 lbf/ft) L = 30.0 ft (lbf/ft) (in) (psi) 42.9 0.0230 972 50.0 0.0268 1130 60.0 0.0321 1360 70.0 0.0375 1590 80.0 0.0428 1810 90.0 0.0482 2040 100 0.0535 2270 200 0.107 4530 300 0.161 6800 400 0.214 9060 500 0.268 1.13 × 104 600 0.321 1.36 × 104 700 0.375 1.59 × 104 800 0.428 1.81 × 104 900 0.482 2.04 × 104 1000 0.535 2.27 × 104 2000 1.07 4.53 × 104 3000 1.61 6.80 × 104 4000 2.14 9.06 × 104 5000 2.68 1.13 × 105 6000 3.21 1.36 × 105 7000 3.75 1.59 × 105 8000 4.28 1.81 × 105 9000 4.82 2.04 × 105 1.00 × 104 5.35 2.27 × 105 1.31 × 104 7.02 2.97 × 105
 Steel I Beam: S15 × 42.9 (S15 inch tall × 42.9 lbf/ft) L = 40.0 ft (lbf/ft) (in) (psi) 42.9 0.0726 1730 50.0 0.0846 2010 60.0 0.102 2420 70.0 0.118 2820 80.0 0.135 3220 90.0 0.152 3620 100 0.169 4030 200 0.338 8050 300 0.508 1.21 × 104 400 0.677 1.61 × 104 500 0.846 2.01 × 104 600 1.02 2.42 × 104 700 1.18 2.82 × 104 800 1.35 3.22 × 104 900 1.52 3.62 × 104 1000 1.69 4.03 × 104 2000 3.38 8.05 × 104 3000 5.08 1.21 × 105 4000 6.77 1.61 × 105 5000 8.46 2.01 × 105 6000 10.2 2.42 × 105 7000 11.8 2.82 × 105 7380 12.5 2.97 × 105
 Steel I Beam: S15 × 42.9 (S15 inch tall × 42.9 lbf/ft) L = 50.0 ft (lbf/ft) (in) (psi) 42.9 0.177 2700 50.0 0.207 3150 60.0 0.248 3780 70.0 0.289 4400 80.0 0.331 5030 90.0 0.372 5660 100 0.413 6290 200 0.826 1.26 × 104 300 1.24 1.89 × 104 400 1.65 2.52 × 104 500 2.07 3.15 × 104 600 2.48 3.78 × 104 700 2.89 4.40 × 104 800 3.31 5.03 × 104 900 3.72 5.66 × 104 1000 4.13 6.29 × 104 2000 8.26 1.26 × 105 3000 12.4 1.89 × 105 3630 15.0 2.28 × 105
 Steel I Beam: S15 × 42.9 (S15 inch tall × 42.9 lbf/ft) L = 60.0 ft (lbf/ft) (in) (psi) 42.9 0.368 3890 50.0 0.428 4530 60.0 0.514 5440 70.0 0.600 6340 80.0 0.685 7250 90.0 0.771 8150 100 0.857 9060 200 1.71 1.81 × 104 300 2.57 2.72 × 104 400 3.43 3.62 × 104 500 4.28 4.53 × 104 600 5.14 5.44 × 104 700 6.00 6.34 × 104 800 6.85 7.25 × 104 900 7.71 8.15 × 104 1000 8.57 9.06 × 104 1750 15.0 1.59 × 105
 Steel I Beam: S15 × 42.9 (S15 inch tall × 42.9 lbf/ft) L = 70.0 ft (lbf/ft) (in) (psi) 42.9 0.681 5290 50.0 0.794 6170 60.0 0.952 7400 70.0 1.11 8630 80.0 1.27 9870 90.0 1.43 1.11 × 104 100 1.59 1.23 × 104 200 3.17 2.47 × 104 300 4.76 3.70 × 104 400 6.35 4.93 × 104 500 7.94 6.17 × 104 600 9.52 7.40 × 104 700 11.1 8.63 × 104 800 12.7 9.87 × 104 900 14.3 1.11 × 105 945 15.0 1.17 × 105
 Steel I Beam: S15 × 42.9 (S15 inch tall × 42.9 lbf/ft) L = 80.0 ft (lbf/ft) (in) (psi) 42.9 1.16 6910 50.0 1.35 8050 60.0 1.62 9660 70.0 1.90 1.13 × 104 80.0 2.17 1.29 × 104 90.0 2.44 1.45 × 104 100 2.71 1.61 × 104 200 5.42 3.22 × 104 300 8.12 4.83 × 104 400 10.8 6.44 × 104 500 13.5 8.05 × 104 554 15.0 8.92 × 104
 Steel I Beam: S15 × 42.9 (S15 inch tall × 42.9 lbf/ft) L = 90.0 ft (lbf/ft) (in) (psi) 42.9 1.86 8750 50.0 2.17 1.02 × 104 60.0 2.60 1.22 × 104 70.0 3.04 1.43 × 104 80.0 3.47 1.63 × 104 90.0 3.90 1.83 × 104 100 4.34 2.04 × 104 200 8.67 4.08 × 104 300 13.0 6.12 × 104 346 15.0 7.05 × 104
 Steel I Beam: S15 × 42.9 (S15 inch tall × 42.9 lbf/ft) L = 100 ft (lbf/ft) (in) (psi) 42.9 2.84 1.08 × 104 50.0 3.31 1.26 × 104 60.0 3.97 1.51 × 104 70.0 4.63 1.76 × 104 80.0 5.29 2.01 × 104 90.0 5.95 2.27 × 104 100 6.61 2.52 × 104 200 13.2 5.03 × 104 227 15.0 5.71 × 104
 Steel I Beam: S15 × 42.9 (S15 inch tall × 42.9 lbf/ft) L = 125 ft (lbf/ft) (in) (psi) 42.9 6.92 1.69 × 104 50.0 8.07 1.97 × 104 60.0 9.68 2.36 × 104 70.0 11.3 2.75 × 104 80.0 12.9 3.15 × 104 90.0 14.5 3.54 × 104 92.9 15.0 3.65 × 104
 Steel I Beam: S15 × 42.9 (S15 inch tall × 42.9 lbf/ft) L = 150 ft (lbf/ft) (in) (psi) 42.9 14.4 2.43 × 104 44.8 15.0 2.54 × 104